In reply to maria85: I get on better with small sacs rather than bumbags and have found 2 that are brilliant:
- The North Face Enduro 18 is a brilliant ~8L sack (I don't know why it's called an 18) with two bottle holsters within easy reach.
- The Inov-8 Race Elite Extreme 10 is a featherweight 10L sack if you need to carry very slightly more but also works well when nearly empty. Again, two pouches for bottles or food accessible on the hoof, but no zipped waistband pockets. Superb pack.
The North Face one has wider shoulder straps but would be worth trying on first (especially as a female) as it has a novel velcro closing system on the chest rather than the usual strap. Both of these seem to have a slightly longer back length, as I don't get on with many packs (e.g. the OMM ones) as when the shoulder straps are done up, the waist belt feels too high up and I prefer it more on my hips.
hth